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Castle O'er 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Castle O'er

Dumfries and Galloway, United Kingdom

Long range weather outlook for Castle O'er includes 14 day forecast summary:

The outlook for Castle O'er in the two weeks ahead shows the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 15°C expected on the afternoon of Friday 21st. The average minimum temperature will be 2°C, dipping to its lowest on the morning of Tuesday 18th at -2°C. The next 14 days will have most days seeing a little rain or sleet. Current predictions suggest Thursday 27th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 18
Mar
15:00

SE
SE

8 / 9 mph 48 / 44°F 47% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

6 / 13 mph 38 / 33°F 70% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

4 / 9 mph 31 / 26°F 89% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 19
Mar
00:00

NE
NE

3 / 6 mph 30 / 27°F 90% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

3 / 5 mph 28 / 26°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

3 / 6 mph 28 / 25°F 79% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

2 / 2 mph 42 / 42°F 51% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

4 / 5 mph 48 / 46°F 41% 1021 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

6 / 7 mph 50 / 47°F 44% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

3 / 7 mph 39 / 36°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

1 / 3 mph 33 / 33°F 81% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 20
Mar
00:00

WSW
WSW

1 / 2 mph 31 / 31°F 81% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

2 / 3 mph 31 / 31°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 19%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

1 / 2 mph 31 / 31°F 85% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

2 / 2 mph 47 / 47°F 68% 1021 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

5 / 6 mph 55 / 53°F 63% 1020 mb
Low level cloud: 4%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

5 / 6 mph 57 / 55°F 64% 1018 mb
Low level cloud: 2%
Mid level cloud: 21%
High level cloud: 4%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

3 / 6 mph 47 / 46°F 86% 1017 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 98%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

2 / 4 mph 41 / 41°F 91% 1018 mb
Low level cloud: 82%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Mar
00:00

E
E

3 / 6 mph 44 / 43°F 87% 1017 mb
Low level cloud: 61%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

3 / 6 mph 44 / 43°F 85% 1015 mb
Low level cloud: 59%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

5 / 11 mph 40 / 37°F 91% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

7 / 9 mph 52 / 49°F 78% 1013 mb
Low level cloud: 6%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

13 / 15 mph 58 / 54°F 65% 1011 mb
Low level cloud: 13%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

13 / 15 mph 59 / 56°F 63% 1008 mb
Low level cloud: 62%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

10 / 15 mph 50 / 45°F 85% 1006 mb
Low level cloud: 12%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

6 / 11 mph 45 / 42°F 81% 1006 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 22
Mar
00:00

NE
NE

6 / 11 mph 42 / 38°F 90% 1003 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

4 / 8 mph 42 / 40°F 94% 1000 mb
Low level cloud: 26%
Mid level cloud: 85%
High level cloud: 2%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

4 / 7 mph 44 / 41°F 97% 998 mb
Low level cloud: 97%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SE
SE

4 / 6 mph 46 / 45°F 97% 998 mb
Low level cloud: 97%
Mid level cloud: 87%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

4 / 4 mph 49 / 48°F 93% 998 mb
Low level cloud: 82%
Mid level cloud: 54%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

6 / 8 mph 53 / 51°F 78% 996 mb
Low level cloud: 55%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

4 / 6 mph 48 / 46°F 92% 997 mb
Low level cloud: 20%
Mid level cloud: 99%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

4 / 6 mph 44 / 42°F 98% 998 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 23
Mar
00:00

SSE
SSE

4 / 6 mph 44 / 42°F 98% 998 mb
Low level cloud: 88%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

5 / 6 mph 43 / 40°F 97% 1000 mb
Low level cloud: 93%
Mid level cloud: 71%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

14 / 17 mph 39 / 31°F 95% 1002 mb
Low level cloud: 86%
Mid level cloud: 66%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

10 / 12 mph 39 / 32°F 93% 1005 mb
Low level cloud: 78%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

9 / 10 mph 43 / 38°F 77% 1006 mb
Low level cloud: 92%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

4 / 4 mph 44 / 42°F 71% 1006 mb
Low level cloud: 84%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

3 / 4 mph 42 / 40°F 81% 1005 mb
Low level cloud: 83%
Mid level cloud: 24%
High level cloud: 13%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

5 / 8 mph 40 / 36°F 89% 1005 mb
Low level cloud: 78%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 24
Mar
00:00

SSW
SSW

7 / 12 mph 37 / 31°F 90% 1004 mb
Low level cloud: 40%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

14 / 19 mph 39 / 31°F 89% 1001 mb
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

15 / 21 mph 39 / 31°F 97% 999 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

13 / 18 mph 42 / 35°F 98% 999 mb
Low level cloud: 97%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

17 / 20 mph 47 / 40°F 67% 1001 mb
Low level cloud: 41%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

17 / 20 mph 46 / 39°F 66% 1003 mb
Low level cloud: 25%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

15 / 22 mph 41 / 32°F 70% 1006 mb
Low level cloud: 18%
Mid level cloud: 1%
High level cloud: 16%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

13 / 21 mph 38 / 30°F 75% 1008 mb
Low level cloud: 24%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 25
Mar
00:00

SW
SW

9 / 11 mph 46 / 42°F 98% 1015 mb
Low level cloud: 93%
Mid level cloud: 22%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

2 / 4 mph 34 / 34°F 95% 1017 mb
Low level cloud: 39%
Mid level cloud: 34%
High level cloud: 24%
Most Significant Cloud Type: low
53%
0.0 In
12:00

W
W

17 / 27 mph 46 / 39°F 87% 1009 mb
Low level cloud: 99%
Mid level cloud: 22%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WSW
WSW

8 / 13 mph 55 / 52°F 94% 1018 mb
Low level cloud: 99%
Mid level cloud: 16%
High level cloud: 49%
Most Significant Cloud Type: low
100%
0.0 In
Wed 26
Mar
00:00

W
W

7 / 10 mph 47 / 44°F 89% 1015 mb
Low level cloud: 80%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: low
82%
0.0 In
06:00

WSW
WSW

4 / 5 mph 42 / 40°F 94% 1016 mb
Low level cloud: 88%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: low
93%
0.0 In
12:00

SW
SW

7 / 10 mph 51 / 48°F 75% 1019 mb
Low level cloud: 78%
Mid level cloud: 43%
High level cloud: 7%
Most Significant Cloud Type: low
93%
0.0 In
18:00

SSW
SSW

15 / 20 mph 46 / 40°F 78% 1011 mb
Low level cloud: 69%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 27
Mar
00:00

SW
SW

10 / 20 mph 39 / 32°F 99% 1000 mb
Low level cloud: 99%
Mid level cloud: 83%
High level cloud: 74%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

7 / 11 mph 43 / 39°F 97% 1007 mb
Low level cloud: 91%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: low
99%
0.1 In
12:00

S
S

12 / 21 mph 42 / 36°F 96% 990 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SSE
SSE

4 / 6 mph 49 / 47°F 95% 1006 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 67%
Most Significant Cloud Type: low
100%
0.1 In
Fri 28
Mar
00:00

W
W

9 / 16 mph 37 / 31°F 93% 985 mb
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SE
SE

2 / 4 mph 42 / 41°F 96% 1008 mb
Low level cloud: 74%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

NNW
NNW

9 / 17 mph 47 / 42°F 67% 990 mb
Low level cloud: 60%
Mid level cloud: 83%
High level cloud: 33%
Most Significant Cloud Type: low
93%
0.0 In
18:00

W
W

3 / 5 mph 47 / 46°F 89% 1012 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
Sat 29
Mar
00:00

NW
NW

4 / 8 mph 30 / 26°F 93% 1003 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.4 In
06:00

SSW
SSW

4 / 8 mph 34 / 31°F 92% 1014 mb
Low level cloud: 18%
Mid level cloud: 5%
High level cloud: 21%
Most Significant Cloud Type: low
22%
0.0 In
12:00

NW
NW

10 / 20 mph 44 / 38°F 62% 1010 mb
Low level cloud: 23%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
18:00

SW
SW

15 / 26 mph 43 / 35°F 98% 1005 mb
Low level cloud: 95%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
Sun 30
Mar
00:00

WSW
WSW

2 / 5 mph 31 / 29°F 93% 1015 mb
Low level cloud: 3%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
0.0 In
06:00

WSW
WSW

11 / 19 mph 38 / 31°F 94% 1007 mb
Low level cloud: 97%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

5 / 10 mph 47 / 45°F 61% 1021 mb
Low level cloud: 100%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

12 / 21 mph 43 / 37°F 81% 1011 mb
Low level cloud: 14%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 31
Mar
00:00

S
S

5 / 11 mph 34 / 29°F 97% 1023 mb
Low level cloud: 23%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

WNW
WNW

8 / 15 mph 33 / 26°F 89% 1020 mb
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
12:00

SW
SW

13 / 27 mph 43 / 37°F 98% 1019 mb
Low level cloud: 100%
Mid level cloud: 60%
High level cloud: 87%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SW
SW

9 / 16 mph 43 / 38°F 74% 1024 mb
Low level cloud: 29%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
48%
0.0 In
Tue 01
Apr
00:00

WSW
WSW

2 / 4 mph 34 / 34°F 91% 1028 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 18%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

SSW
SSW

13 / 23 mph 42 / 35°F 98% 1023 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

10 / 21 mph 49 / 45°F 59% 1029 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 4%
Most Significant Cloud Type: medium
18%
0.0 In
18:00

SSW
SSW

16 / 30 mph 46 / 40°F 97% 1022 mb
Low level cloud: 94%
Mid level cloud: 11%
High level cloud: 56%
Most Significant Cloud Type: low
100%
0.0 In
Wed 02
Apr
00:00

S
S

4 / 8 mph 36 / 33°F 88% 1027 mb
Low level cloud: 1%
Mid level cloud: 21%
High level cloud: 29%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

SSW
SSW

14 / 26 mph 45 / 38°F 95% 1022 mb
Low level cloud: 97%
Mid level cloud: 1%
High level cloud: 15%
Most Significant Cloud Type: low
98%
0.0 In
12:00

S
S

9 / 19 mph 52 / 49°F 70% 1022 mb
Low level cloud: 98%
Mid level cloud: 29%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

7 / 13 mph 49 / 46°F 80% 1020 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In

Other Locations Near to Castle O'er

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure